do you have a contact number for your midwife? if so, i would ask her. if you have a bladder infection (or something of that sort) you are best to get it sorted out asap. having said that, i get irritation sometimes (and definitely stinging) but i have always put it down to the difference in acidity of sperm (sorry if tmi) and the slight soreness of friction. if you are worried then always ask!!! good luck...